Further Edit: I think this is probably down to a direction error on my part, apologies. Edit: I think I'm wrong with my description here, I was just playing another game (582884086) and the second parry card in my hand didn't trigger from a different attack. Game 1287872901 My warrior had already used one Parry this turn, a Goblin Bezerker used Powerful Hack, which didn't trigger my second parry card. My warrior had Unholy Frenzy active at the time. The type of attack is "Melee Slashing" if that makes a difference, it's entirely possible this is intended and I've just misunderstood some behaviour. Thanks.
Ah, there's a good chance that's what happened and I mistook which enemy was attacking, I should have nabbed a screenshot. I thought it was the same enemy in both instances, I was probably mistaken, I suspect this is probably not an issue. Thanks.